docs: def check_valid_border(border):
      """\
      Raises a ValueError iff `border` is negative.
  
      :param int border: Indicating the size of the quiet zone.
      """
      if border is not None and (int(border) != border or border < 0):
          raise ValueError('The border must not a non-negative integer value. '
                           'Got: "{0}"'.format(border))